Cheapest return flights from Seattle to San Juan in October from 302€

AirHint found the following cheapest return flights from Seattle (SEA) to San Juan (SJU) in October 2025 (see full year).

Return flights

24 Oct - 13 Nov Frontier Airlines
29 Oct - 15 Nov Frontier Airlines
24 Oct - 01 Nov Frontier Airlines
29 Oct - 31 Oct Alaska Airlines
25 Oct - 02 Nov Frontier Airlines
26 Oct - 15 Nov Frontier Airlines
30 Oct - 03 Nov Frontier Airlines
24 Oct - 02 Nov Frontier Airlines
20 Oct - 27 Oct Frontier Airlines
20 Oct - 25 Oct Frontier Airlines
23 Oct - 28 Oct United
20 Oct - 20 Oct Alaska Airlines

Also check the deals for one-way flights from Seattle to San Juan in October.

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